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| author | MerryMage <MerryMage@users.noreply.github.com> | 2016-04-16 10:21:41 +0100 |
|---|---|---|
| committer | Subv <subv2112@gmail.com> | 2016-05-21 11:14:09 -0500 |
| commit | ca17df5757f08c7bb673aec19e0fdd4698dd904f (patch) | |
| tree | 4f767cec3763de660a3fed6c2b9110f8124a0d0f /src/core/memory.cpp | |
| parent | 2be17a0c6e0a386b78e09dc6341182d3fe605d41 (diff) | |
Memory: ZeroBlock
Diffstat (limited to 'src/core/memory.cpp')
| -rw-r--r-- | src/core/memory.cpp | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/core/memory.cpp b/src/core/memory.cpp index c7b99a4670..1604a7da5d 100644 --- a/src/core/memory.cpp +++ b/src/core/memory.cpp @@ -457,6 +457,44 @@ void WriteBlock(const VAddr dest_addr, const u8* src_buffer, const size_t size) } } +void ZeroBlock(const VAddr dest_addr, const size_t size) { + size_t remaining_size = size; + size_t page_index = dest_addr >> PAGE_BITS; + size_t page_offset = dest_addr & PAGE_MASK; + + while (remaining_size > 0) { + const size_t copy_amount = std::min(PAGE_SIZE - page_offset, remaining_size); + const VAddr current_vaddr = (page_index << PAGE_BITS) + page_offset; + + switch (current_page_table->attributes[page_index]) { + case PageType::Unmapped: { + LOG_ERROR(HW_Memory, "unmapped ZeroBlock @ 0x%08X (start address = 0x%08X, size = %zu)", current_vaddr, dest_addr, size); + break; + } + case PageType::Memory: { + DEBUG_ASSERT(current_page_table->pointers[page_index]); + + u8* dest_ptr = current_page_table->pointers[page_index] + page_offset; + std::memset(dest_ptr, 0, copy_amount); + break; + } + case PageType::Special: { + DEBUG_ASSERT(GetMMIOHandler(current_vaddr)); + + static const std::array<u8, PAGE_SIZE> zeros = {}; + GetMMIOHandler(current_vaddr)->WriteBlock(current_vaddr, zeros.data(), copy_amount); + break; + } + default: + UNREACHABLE(); + } + + page_index++; + page_offset = 0; + remaining_size -= copy_amount; + } +} + template<> u8 ReadMMIO<u8>(MMIORegionPointer mmio_handler, VAddr addr) { return mmio_handler->Read8(addr); |